public class Exam {
    public static void main(String[] args) {
        int i = 1;
        i = i++; //（1）先取i的值1（2）i紧接着自增1 i=2 (3)把之前取出来的i的值重新赋值给i   i=1
        System.out.println(i);//1

        int j = 1;
        i *= i+j; //等价于 i = i * (i+j)
        System.out.println(i);//2
    }
}
